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| Question | Answer |
| What is the chemical equation of the thermal decomposition of limestone? | CaCO3(s) > CaO(s) + CO2(g) |
| What is limestone, mainly? | Calcium carbonate CACO3 |
| What is the resulting process of heating limestone called? | Thermal decomposition |
| What other elements/compounds have the same chemical equation when thermally decomposing? | Magnesium, copper, zinc and sodium carbonates. |
| What is the chemical equation of limestone reacting with sulfuric acid? | CaCO3 + H2SO4 > CaSO4 + CO2 + H20 |
| What other carbonates react with acids? | Magnesium, copper, zinc and sodium. |
| Calcium oxide + water = ? | Calcium hydroxide - Ca(OH)2 |
| What is a use of calcium hydroxide in fields and why? | It can be used to neutralise acidic soil. Powdered limestone can be used too but calcium hydroxide is much quicker. |
| How can it also be used as a test? | By making a solution of calcium hydroxide in water, called limewater. |
| What is it a test for? | Carbon dioxide - CO2 |
| How can you tell if the test comes out positive? | The water will turn cloudy. |
| Why is this? | Because of the formation of calcium carbonate. |
| What is the formula? | Ca(OH)2 + CO2 > CaCO3 + H2O |
| Name three things that limestone can also be used for/to make? | Cement, mortar and concrete. |
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